Stefanie Schaffer was one of the 12 people on a tour boat in the Bahamas when the vessel went up in flames, according to ABC7.
According to news accounts, Stefanie Schaffer sustained life-threatening injuries and had to have both legs amputated.More news: Amazon to Extend Prime Day on July 16 to 36 Hours
"We heard she is in a medically-induced coma, and I don't think she knows that she doesn't have any legs left", Brian Schaffer said, adding that doctors are waiting for the 22-year-old to stabilize before flying her to the United States.
Stefanie Schaffer, 22, had been holidaying on the islands with her family when the tourist boat they were on burst into flames. ABC 11 has video of passengers on another boat trying to help the victims.
Royal Bahamas Police Force Superintendent Shanta Knowles says officials from the country's police, fire and civil aviation departments were on the island of Great Exuma on Monday conducting an investigation into the explosion and fire. They were initally treated for their injuries at the Princess Margaret Hospital in Nassau, Bahamas.More news: Australias Finch smashes own record for highest T20I score
Stefanie's sister, Brooke, also suffered broken bones and internal injuries, while their mother and stepfather, Stacey and Paul Bender, suffered cuts and bruises. Police have not yet identified the person who was killed. Brooke and Paul managed to escape the blast with minor injuries, but Stacey also suffered serious injuries in the blast.
The U.S. Coast Guard, responding to a message for help, air lifted four passengers to a Florida hospital, according to the Bahamas Press.
Investigators are still determining what caused the explosion.More news: Thunder are angling for seven more seasons of Paul George
A photo of the Schaffer family posted to GoFundMe page.